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Adam conoce a Eph: un módulo de reconocimiento de sustrato de ADAM actúa como un interruptor molecular para la

Peter W Janes¹, Nayanendu Saha, William A Barton

¹Department of Biochemistry and Molecular Biology, PO Box 13D, Monash University, Victoria 3800, Australia.

|October 22, 2005

Resumen

ADAM10 (una metaloproteasa) divide los ligandos efrina-A5 que se unen a los receptores EphA3, mediando la repulsión celular. Este proceso, que ocurre entre células opuestas, asegura que solo las efrinas unidas sean el objetivo de la escisión.

Área de la Ciencia:

Biología celular Biología celular.
Los mecanismos moleculares de la comunicación célula-célula.
La función de la proteasa en la señalización de señales.

Sus antecedentes:

Las tirosinacinasas del receptor Eph y los ligandos de la efrina median la comunicación célula-célula.
La metaloproteasa ADAM10 rompe la efrina-A2, causando así la repulsión celular.
La regulación de la interacción de ADAM10 con las efrinas no se entiende completamente.

Objetivo del estudio:

Para dilucidar el mecanismo por el cual ADAM10 selectivamente escinde las efrinas unidas a Eph.
Para definir la base estructural y funcional para la interacción ADAM10-efrina.
Para entender la regulación de la proteólisis de la efrina mediada por ADAM10.

Principales métodos:

Análisis estructural de los dominios ADAM10.
Estudios funcionales en los que se utilizó el complejo EphA3/efrina-A5.
Investigar las interacciones proteína-proteína y los eventos de escisión.

Principales resultados:

ADAM10 reconoce el complejo EphA3 / ephrin-A5 a través de un módulo específico de reconocimiento de sustrato.
Una formación de complejo funcional crea un motivo de reconocimiento para ADAM10.
La escisión de la efrina-A5 por ADAM10 ocurre en trans entre células opuestas.

Conclusiones:

ADAM10 utiliza un módulo de reconocimiento de sustratos que involucra sus dominios ricos en cisteína y desintegración.
La formación de complejos entre EphA3 y ephrin-A5 es crítica para la unión y escisión de ADAM10.
Un mecanismo de acción trans regula la proteólisis de la efrina mediada por ADAM10, lo que garantiza la especificidad.

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